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Yoni Nijman avatar image
Yoni Nijman asked

SOC synchronisation BMV 700

For some reason the SOC calibration isn't what it should be.

I've seen a video on YouTube to adjust settings for solar charging charged voltage 0.3v under absorption voltage in normal operation it should be under float voltage

But when my 75 15 mppt is in end of absorption it resets it's state of charge.

Mppt keeps charging for a few more hours with 4 amps that means the reading is not close to accurate.

BMV and Smart Solar both Bluetooth connected also with a battery smart, if the mppt and the BMW could talk it could reset it's state of charge when it hits float charge.


Any settings to change to get it as close as accurate?


Thanks Yoni


BMV Battery MonitorSOCsmart solar set-up help
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boekel avatar image boekel ♦ commented ·

this can be difficult to get exactly right with small solar chargers in the system, but it can be done with some tweaking.

For a start, please tell us what kind of batteries you use and if there are any other components in the system.

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Mark avatar image
Mark answered ·

I assume that you have correctly entered the battery C20 capacity in the BMV?

If this is already correct, then based on what your saying I would probably try reducing the tail current % slightly next.

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Yoni Nijman avatar image Yoni Nijman commented ·

I commented above this.

C20 is dialed in but it make sense to lower the tail current think I'll go for 1 or 1.5 percent.

I have a look if this works better but I need some sun to test :)


Thank you for your reply




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